Chapter 3 Memory Mapping Control (S12XMMCV4)
MC9S12XE-Family Reference Manual , Rev. 1.19
188
Freescale Semiconductor
3.1.1
Terminology
3.1.2
Features
The main features of this block are:
•
Paging capability to support a global 8 Mbytes memory address space
•
Bus arbitration between the masters CPU, BDM and XGATE
Table 3-2. Acronyms and Abbreviations
Logic level “1”
Voltage that corresponds to Boolean true state
Logic level “0”
Voltage that corresponds to Boolean false state
0x
Represents hexadecimal number
x
Represents logic level ’don’t care’
byte
8-bit data
word
16-bit data
local address
based on the 64 KBytes Memory Space (16-bit address)
global address
based on the 8 MBytes Memory Space (23-bit address)
Aligned address
Address on even boundary
Mis-aligned address
Address on odd boundary
Bus Clock
System Clock. Refer to CRG Block Guide.
expanded modes
Normal Expanded Mode
Emulation Single-Chip Mode
Emulation Expanded Mode
Special Test Mode
single-chip modes
Normal Single-Chip Mode
Special Single-Chip Mode
emulation modes
Emulation Single-Chip Mode
Emulation Expanded Mode
normal modes
Normal Single-Chip Mode
Normal Expanded Mode
special modes
Special Single-Chip Mode
Special Test Mode
NS
Normal Single-Chip Mode
SS
Special Single-Chip Mode
NX
Normal Expanded Mode
ES
Emulation Single-Chip Mode
EX
Emulation Expanded Mode
ST
Special Test Mode
Unimplemented areas
Areas which are accessible by the pages (RPAGE,PPAGE,EPAGE) and not implemented
External Space
Area which is accessible in the global address range 14_0000 to 3F_FFFF
external resource
Resources (Emulator, Application) connected to the MCU via the external bus on
expanded modes (Unimplemented areas and External Space)
PRR
Port Replacement Registers
PRU
Port Replacement Unit located on the emulator side
MCU
MicroController Unit
NVM
Non-volatile Memory; Flash EEPROM or ROM
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
S12XE
products
in
208
MAPBGA
packages